According to HousingWire, the law firm Hagens Berman is actively seeking homebuyers from the Chicago area who purchased property on or after April 24, 2026, to potentially join an antitrust class action lawsuit. The firm believes these buyers may have overpaid for their homes due to what they characterize as an illegal monopoly in the local real estate market controlled by Compass and MRED, the regional MLS system serving the Chicagoland area.
The core of Hagens Berman's investigation centers on market control and access. According to the firm's allegations, Compass and MRED together hold roughly 98% of the listing market in Chicago, which they claim use this dominance to keep certain properties off the public MLS. The attorneys argue this creates a two-part problem for buyers: some never even learn about private listings, and when those properties eventually hit the open market, buyers lack crucial information like days-on-market data that would help them understand fair pricing.
Hagens Berman is pointing to Compass's own internal data to support their claims. The company analyzed roughly 70,000 of its transactions between April 2025 and March 2026 and found that homes initially listed as "Private Exclusive" or "Coming Soon" before reaching the MLS sold for 4.6% higher than comparable homes that went directly to the open market. Notably, this premium jumped from a 2.9% increase that Compass reported in a similar analysis the year before, suggesting the gap is widening over time.
The attorneys frame this gap as a cost borne by buyers rather than a benefit to sellers, as Compass had characterized it. They argue that buyers are essentially paying more for homes priced above what an open market would support, without the information needed to recognize the markup. HousingWire notes that neither MRED nor Compass offered substantive comments on the allegations, and that this suit adds to existing antitrust pressure, as Zillow is currently suing both companies in a separate case alleging they conspired to withhold listing data from that portal.
What I am seeing locally here in the Bay Area is that these kinds of market structure questions are becoming harder to ignore nationwide. Chicago's situation highlights how listing market control and information asymmetry can directly affect what consumers pay, and it's a dynamic worth watching as our own regional MLS ecosystems face similar scrutiny. These antitrust investigations remind all of us that transparency and fair market access matter enormously in how properties are valued and sold.
